Cool place... Diverse (mostly electronic) club nights, plus frequent live music.
Getting there: From the hostel, take the U3 line (direction 'Simmering') to Volkstheater, then change to the U2 (direction 'Seestadt') and get off at Pratastern.
Getting back: The U-Bahn runs back to Westbahnhof through the night Fri & Sat. From Sun - Thurs, the last train at night is around 00:30; After that you can have a kebab and wait for the first morning U-Bahn (around 05:00), or grab an uber / taxi.